In vitamin B5, soybean powder (5.0 g) was extracted with 25 mL
of distilled water for 10 min using a 40 C sonicator, followed by
adding 2 mL of 3% acetic acid solution. The sample mixture was reextracted
under a sonicator at 40 C for 10 min, and made up with
distiled water for 50 mL